Electric gearing motor with centrifugal clutch



April 9, 1929. w. R. UGGLA ET AL ELECTRIC GEARING MOTOR WITH CENTRIFUGAL CLUTCH Filed June 27, 1927 gregate, through which arrangement space Patented Apr. 9, 1929.

UNITED STATES PATENT OFF WILHELM ROBERT ICE.

UGGLA, OF MORBY, STOCKS UND, AND AUGUST GU NNAR FERDI- RAND WALLGREN, 0F STOCKH OLM, swEpEN.

ELECTRIC GEARING MOTOR WITH CENTRIFUGAL CLUTCH.-

Applieation filed June 27, 1927, Serial No.

Centrifugal clutch es for the transmitting of the power has previously been provided at electric motors. Clutches of this type permit the starting of the motor. without load and short circuited but regarding theprotection of the motor against sudden strains the centrifugal clutch is without importance, because electric motors frequently are connected with the power transmitting shaftby a belt. The said belt constitutes itself a friction device which protects the motor. Electrio motors together with a toothed gearing for the reducing of the velocity and a friction clutch have also been proposed and used in such cases, as the driven machine; for instance a stone-crusher, digging machine etc. runs in a thrusting manner. In such cases, however, motor, gearing and clutch were separated from each other and not combined to 'an aggregate, which rendered the mounting correspondingly laborious and expensive, and besides the combination requires great space. In order to remove the said drawbacks the motor, bearing and clutch accord ing to this invention are combined toan agis' spared, uniformity is gained and gearing motors with centrifugal clutch of standard type may be manufactured and used. In the said a gregate the clutch transmits power from the rotor to the gearing and in order that the aggregate may require the smallest possible space and a simple construction may be gained the clutch is located on the opposite side of the rotor with regard to the. gearing. Y

Fig. 1 of the accompanying drawing shows in a longitudinal section a gearing motor with centrifugal clutch. Fig.,,2 is an end view of the caring motor and shows at the left hand si e thesaid clutch in section on the line AB in Fig. 1 and at the right hand side a section on the line B-C in the same figure. Fig. 3 shows the gearing diagrammatically and in an end view. The electr c motor Aand toothed gearing B are mounted in a casing 1 common to the same. The shaft 2 of the rotor 3 and the shaft 5 driven by the same'are located co-axially in the formv of execution shown as an example in the drawing. The shaft 2 rotates by means of a centrifugal clutch shown at the left hand side of Fig. 1 and described below the shaft 5, which extends through the sleeve shaped shaft 2 and at its right end carries the driving and pinions' 1 201,815, and in Sweden August 14, 19 26.

gearing B. The said gearing uitable construction and comprises according to the drawing two auxiliary shafts 7 and 8, carrying toothed wheels 9 and 10 respectively meshing with the pinion 6, 1 and 12 meshing with a toothed wheel 13,4vhich is provided on the outgoing, driven shaft 14. The shaft 2 is journaled in a ball bearing 15, provided in a wall 17 fixed pinion 6 of the may be of any s to the cup shaped cover 18 of the casing 1,

and the shaft 5 is journalled in ball bearings 19 and 20 arranged'in the said cover 18 and ina partition wall 21, lo 1. The auxiliary shafts 7 in bearings provided in wall 21 and in the end wal and the driven shaft 14 in ball bearings 23 prov and 8 are journaled the said partition 1 22 of the casing 1, finally is journalled ided in the said end wall 22. All the said bearings are located in the same horizontal plane at whichthe casing 1 and its cover 18 are divided, so that after the removing'of the top part of the casing and the cover the bearings and also the clutch provided in the cover 18 are free for inspec -tion, adjusting and repairing; The clutch shown in the drawing consists of a frictional clutch, which is caused to' operate by the centrifugal force. 3 a disc 24 is connected, to which for instance eight plate springs 25 are fixed, each carrying a block 26 covered with a friction increasing inateriah While the'shaft 2 is rotated, the said blocks 26 are swung outwards by the centrifugal power and forced against the inner side of a drum 27 fixed on theshaft 5. The stiffness of. the springs 25 peripherally is so adapted, that the springs bring with them selves the drum 27 and thus transmit the motive power from the shaft 2 of the rotor 3 to the shaft 5. A fan 28 fixed to the shaft 2 causes air entering at 29 to pass'through the casing, cooling the motor. The sa d cooling air leaves the casing through op'emngsBt). The-admission opening 29 for they cooling a r is provided in the cover 18, so that the air sweeps partially round the cover 18 and thus cools thesame and the centrifugal clutch. Owing to the described arrangement the clutch is hermetically enclosed which 1s of importance when the gearing motor operates in such places, in which there existexploswe gases or matters, for instance in mines, powder-factories etc.. Ignition through sparks effectedgby the clutch is thus excluded.

-As perceived from the drawing and the cated in the casing I To the shaft 2 of the rotor above specification, the motor, clutch and gearing constitute a whole or an aggregate, which may be manufactured and sold in certain standard types, ready for immediate use. Through the providing of the clutch in such manner, that it transmits the motive power to the toothed gearing in order to be then further transmitted through the latter, the gearing is protected against injurious strains, owing to the fact that in the case of overloading the clutch slides. The cover 18 enclosing the clutch may, evidently be divided on a vertical plane for rendering possible a simple dismounting. The cover enclosing the clutch may, if wanted, be made integral with casing of the gearing motor. Other centrifugal clutches of known or suitable construction may, evidently, he substituted for the clutch shown in the drawing.

l/Ve claim:

1. The combination of an electric motor, a gearing provided in the casing of the motor and disposed at one end of its rotor, a hollow shaft carrying the rotor, and a centrifugal clutch provided at the opposite end of the rotor and havingone part connected to the shaft of the rotor and its other part connected to a shaft, extending through the shaft of the rotor, the driving member of thelsaid gearing being connected to the shaft last mentioned.

2. The combination of an electric motor,

shaft carrying the rotor, provided at the opposite end of the rotor and having one part connected to the shaft of the rotor and its other part connected to a a gearing provided in the same casing as the motor and at the one end of its rotor, a hollow shaft carrying the rotor, a centrifugal clutch provided at the opposite end of the rotor and having one part connected to the shaft of the rotor and its other part connected to a shaft extending through the shaft of the rotor, the driving member of the said gearing being connected to the shaft last mentioned, and a casing connected to the casing of'the motor the clutch, said casing-enclos-.

and enclosing ing the clutch being divided on a plane extending longitudinally of the clutch.

3. The combination of an electric r'm'otor,

a gearing provided in the same casing as the motor and at the one end of its rotor, a hollow a centrifugal clutch shaft extending through the shaft of the rotor, the driving member of the said'gearing being connected to the shaft last mentioned, and a casing connected to the casing of 'the motor and enclosing the clutch, an openring admitting -motor being provided in the casing enclosing the clutch.

air for the ventilation of the In testimony whereof We have hereunto affixed our signatures.

Willlfihhl QUEER illGGlLA. Allfill ll' G UllilAlt FERHHNAND WALLGREN. 

